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SECTION 2.04.7 <br />HYDROLOGY DESCRIPTION <br />Table of Contents <br />Page No. <br />SITE SPECIFIC GROUND WATER INFORMATION AND BASELINE DATA 1 <br />Introduction 1 <br />Baseline Ground Water Levels 2 <br />Alluvial Water Level 2 <br />OverburdenWater Levels 3 <br />Dakota Coal Water Levels 3 <br />Underburden Water Levels 3 <br />Backfill Water Levels 4 <br />Recharge and Hydrologic Boundaries 4 <br />Infiltration and Permeability of the Unsaturated Zone 4 <br />Discharge 5 <br />Evapotranspiration 6 <br />Aquifer Characteristics of the New Horizon Mining Areas 6 <br />Baseline Ground Water Quality 7 <br />Overburden Zone Ground Water Quality 8 <br />Coal Zone Ground Water Quality 8 <br />Underburden Zone Ground Water Quality 10 <br />Springs and Seeps — Present Ground Water Use 10 <br />Present Ground Water Use 11 <br />Potential Ground Water Use 11 <br />REGIONAL SURFACE WATER CHARACTERISTICS 14 <br />Regional Surface Water Flow 14 <br />Regional Surface Water Quality 16 <br />SITE SPECIFIC SURFACE WATER INFORMATION 16 <br />NHN Permit Area Geomorphology 16 <br />Surface Water Monitoring 17 <br />Surface Water Flow 18 <br />Surface Water Quality 19 <br />Channel Characteristics 21 <br />Predicted Peak Flows 21 <br />Relationships Among Flow, TSS and TDS 21 <br />Stock Water Ponds 21 <br />November 2011 <br />